Ogryn
5-8% Strength for 4.5s on Kill. Stacks 5 times.
Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
7-10% Strength for every 4 Single Target Hits. Lasts 2s and Stacks 5 times.
Honestly I don't play much Gunlugger, but when there are two melee Ogryn or multiple Staff Psykers on my team I will. Because of that I don't have a lot of experience or testing or practice. The Karsolas Mk II Delver's Pickaxe is able to both kill armored enemies and horde clear pretty easily with little Talent investment, helping conserve as much ammo as possible. And you'll need the ammo to take advantage of Blaze Away effectively for the Achlys Mk VII Twin-Linked Heavy Stubber; whenever you do need to shoot, try not to stop until everything except a couple Groaner/Poxwalker are left. The Bigger Box of Hurt can suppress or knock down large crowds for quite some time, helping Revives. Or just pop a priority target out of a crowd as you're approaching.